Flow Regimes in Two-Dimensional Ribbed Diffusers

[+] Author and Article Information
F. D. Stull

Ramjet Engine Div., Air Force Aero Propulsion Lab., Wright-Patterson Air Force Base, Ohio

H. R. Velkoff

Mechanical Engineering Dept., Ohio State University, Columbus, Ohio

J. Fluids Eng 97(1), 87-96 (Mar 01, 1975) (10 pages) doi:10.1115/1.3447223 History: Received August 14, 1974; Online October 12, 2010


Water table flow visualization tests of a straight wall diffuser and corresponding ribbed diffuser were conducted over a wide range of total divergence angles and diffuser length to throat width ratios. Rib parameters such as inter-rib cavity depth to width ratio, inter-rib cavity width, rib thickness, and number of ribs were varied, as well as rib contour. Motion pictures were obtained of the secondary flow patterns occurring within the inter-rib cavities, and hot film measurements were made to determine the extent of velocity fluctuations induced by the cavities. In general, the addition of ribs increased the no-appreciable stall regime.

Copyright © 1975 by ASME
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